The Bently Nevada 330881-16-00-385-06-02, also cataloged as the 330881 PROXPAC XL Proximity Transducer, operates as a dedicated hardware component for non-contact shaft displacement measurement within Bently Nevada 3300 monitoring systems.

Model Configuration Overview

The 330881-16-00-385-06-02 configuration integrates a 3300 XL 8 mm eddy-current proximity probe with a factory-installed probe sleeve and a 1 m integral cable assembly. The assembly uses a 385 mm probe penetration length, without a standoff adapter, and includes NPT mounting fittings for mechanical installation.

The configuration code represents the physical assembly options provided by the manufacturer. The suffix selection defines probe type, mechanical adapter configuration, penetration length, fitting arrangement, and mounting thread interface.

Hardware Specifications

Eddy-Current Signal Scaling and Gap Voltage Validation

The 330881-16-00-385-06-02 uses the Bently Nevada 3300 XL eddy-current sensing principle to measure relative shaft position through electromagnetic field variation. Proper probe calibration requires verification of the electrical gap voltage, with typical Bently Nevada systems targeting approximately -10 VDC for the nominal operating gap condition.

The probe signal scaling depends on the relationship between probe tip distance and oscillator output voltage. Installation verification should confirm probe linear range, gap voltage stability, and cable connection integrity before connection to the monitoring rack.

Ordering Information

The delivered assembly includes:

• 1 x Bently Nevada 330881-16-00-385-06-02 PROXPAC XL Proximity Transducer assembly
• 1 x 3300 XL 8 mm proximity probe with integrated 1 m cable
• 1 x PROXPAC XL PPS housing assembly
• 1 x 3/4-14 NPT mounting fitting
• 1 x 3/4-14 NPT to 1/2-14 NPT stainless steel reducer
• 2 x threaded plugs

Additional items such as monitoring modules, extension cables, calibration documents, and system rack components are separate unless specifically included.

Field Installation Guidelines

Mechanical Mounting

• Verify the mounting thread condition before installation.
• Ensure the probe tip has sufficient clearance from rotating components.
• Avoid mechanical impact on the probe sleeve and housing during installation.

Electrical Connection

• Maintain proper shielding practices for proximity signal wiring.
• Route probe cables separately from high-current power conductors to reduce electrical interference.
• Confirm connector cleanliness and cable insulation condition before operation.

Gap Adjustment

• Adjust the probe position according to the monitoring system calibration procedure.
• Verify the gap voltage after installation.
• Confirm stable signal output before placing the machinery into service.

Frequently Asked Questions

• What measurement principle does the 330881 use?

  The unit uses eddy-current technology to detect shaft displacement by measuring changes in the electromagnetic field between the probe tip and rotating target.

• Is the 330881 compatible with the Bently Nevada 3300 system?

  Yes. The assembly is designed around the 3300 XL 8 mm proximity probe technology used within Bently Nevada monitoring architectures.

• Does this model include a standoff adapter?

  No. The 330881-16-00-385-06-02 configuration does not include a standoff adapter.

• What is the purpose of the PPS housing?

  The PPS housing provides mechanical protection and environmental resistance for installations requiring Type 4X and IP66 enclosure characteristics.

• What gap voltage should be checked during setup?

  Bently Nevada proximity systems commonly verify approximately -10 VDC gap voltage for nominal probe operating position.

• Can the probe cable be installed near power cables?

  Signal cables should be separated from high-current conductors to reduce electromagnetic interference and measurement disturbance.

• Does the assembly include monitoring electronics?

  No. The assembly contains the transducer hardware only. Monitoring modules and rack electronics are separate components.

• What should be checked before commissioning?

  Verify mechanical alignment, probe clearance, wiring integrity, shielding connection, and stable signal output before operation.